JP7023596B2 - Easy-to-open package manufacturing method and easy-to-open package formed by the manufacturing method - Google Patents

Description

INDUSTRIAL APPLICABILITY The present invention relates to a method for producing an easily-openable package that can be arbitrarily set in heat-sealing strength, has excellent easy-to-open properties, and can be manufactured with simple equipment, and an easy-to-open package formed by this method. It's about the body.

In the packaging of foods, etc., from the viewpoint of ensuring the safety of products, the packaging is required to have a high sealing property in order to maintain the sealing property, while it is required to have a functionality that can be easily opened. There is.

Then, there is a method of using an easy peel film as one of the methods of imparting the above-mentioned sealing property and functionality to the package, but it is necessary to mainly use a co-extruder to manufacture the easy peel film. However, since this co-extruder is expensive, the number installed at the laminating film manufacturer level is not large.

By the way, in a resin film package using an easy peel film, the following three types of easy-opening means that can be easily opened by hand are known, and these are referred to as a lid material using an easy peel film. , The case of heat-sealing the cup material will be described as an example.

First, as shown in FIG. 10A, the lid material and the cup material are heat-sealed, and when the lid material is peeled off, the seal layer of the lid material easy peel film is coagulated and broken, and the seal can be opened.

This type uses, for example, a blend of two types of incompatible resins such as polypropylene resin and polyethylene resin for the seal layer, and when opening, this layer is peeled off by coagulation failure. ..

However, with this method, the opening strength may become too strong and it may be difficult to open the package easily depending on the heat sealing conditions and grade.

As the second mechanism, as shown in FIG. 10B, the lid material and the cup material are heat-sealed, and when the lid material is peeled off, the seal layer of the lid material easy peel film and the cup material are peeled off at the interface. Is.

However, in this type, when heat-sealed, depending on the compatibility between the lid material easy peel film and the cup material, complete adhesion may be performed and the easy peel property may be lost.

As shown in FIG. 10 (C), the third mechanism is a so-called delamination type in which the lid material and the cup material are heat-sealed and when they are peeled off, they are peeled off between the layers of the lid material easy peel film.

This type utilizes the fact that the peel strength between layers is weaker than the adhesive strength at the interface of the heat-sealed seal layer, but the peel strength between layers is less affected by the heat-sealing conditions, so the material It is possible to easily open the lid material with a certain peeling strength of origin.

As described above, among the three easy peel mechanisms, the delamination type (C) is suitable for providing a package with excellent heat seal strength stability, but it is currently on the market. Since the delamination film used is mainly manufactured by a co-extruder, this requires a large amount of equipment and installation cost.

In addition, the delamination type easy peel film has a narrow selection of materials on the market, that is, the peel strength at the time of opening may not be set to an arbitrary strength, even if it can be set to an arbitrary strength. However, it may not be balanced with the cost.

Further, the arbitrary strength setting may be adjusted depending on the heat sealing conditions, but the heat sealing start temperature, which is peculiar to the material, cannot be adjusted.

The inventor of the present invention has found that the above-mentioned problems can be solved by using a film and a resin exhibiting various easy peeling properties as described above and an extrusion laminating method as a method for solving the above-mentioned problems. I arrived.

The present invention is a method for producing an easily open package, which comprises at least two layers of a sealant layer formed by melt-extruding a specific synthetic resin by an extrusion laminating method on a support layer. It provides an easy-to-open package formed by a manufacturing method.

Explaining the invention of the present application below, the invention according to claim 1 is a resin that does not have an easy-peel property as a sealant layer with respect to an unstretched film support layer having an easy-peel property in a method for producing an easy-to-open package. The sealant layer has a thickness of 5 to 12 μm, and the sealant layers or the sealant layer and the heat-sealable thermoplastic resin layer and the sealant layer are heated. It is characterized in that when the sealant layer is sealed and then peeled off, the sealant layer is broken and then peeled off between the layers of the unstretched film support layer and the sealant layer.

Further, the invention according to claim 2 is the method for producing an easily openable package according to claim 1, wherein the sealant layer is a polyolefin, a cyclic polyolefin, ethylene and vinyl alcohol, vinyl acetate, or acrylic acid. Alternatively, it is characterized in that it contains at least one thermoplastic resin selected from a copolymer with methacrylic acid, ionomer, polyester, polyamide, and polystyrene as a main component.

The invention according to claim 3 is characterized in that the easily openable package made of the lid material of the cup-shaped container is formed by the manufacturing method according to claim 1.

The invention according to claim 4 is characterized in that an easily open package having a pillow bag, a gusset bag, a three-sided bag, a four-sided bag, or a stand pouch is formed by the manufacturing method according to claim 1. It is to be.

There are three examples of combinations of the types of the support layer and the sealant layer of the easy-to-open package in the present invention, and the preferred combination is (1) the support layer is a film exhibiting easy peelability with respect to the sealant layer. The specific synthetic resin of the sealant layer is a group consisting of polyolefin, cyclic polyolefin, ethylene and vinyl alcohol, vinyl acetate, or a copolymer of acrylic acid or methacrylic acid, ionomer, polyester, polyamide and polystyrene. The main component is at least one thermoplastic resin selected from the above, and the selection conditions are appropriately selected depending on the type of the thermoplastic resin (adhesive) to be heat-sealed with the sealant layer.

Further, as another combination method, (2) the same material in which the support layer and the sealant layer show mutual easy peeling property, or (3) the polyolefin film in which the support layer does not show easy peeling property, and the sealant layer Similarly, an easily openable package can be obtained even when the product exhibits an easy peel property with respect to the support layer.

In the present invention, by adopting the above structure, the support layer and the sealant layer both exhibit easy peelability between the layers.

Therefore, for example, when the sealant layers are heat-sealed with each other or the thermoplastic resin layer and the sealant layer that can be heat-sealed with the sealant layer are heat-sealed and then peeled off, the support layer and the sealant layer are separated after the sealant layer is broken. Since it is peeled off between the layers, it can be easily opened.

Further, since the sealant layer melt-extruded with respect to the support layer is melt-extruded by a general laminated packaging film manufacturing machine, a delamination film (packaging body) can be manufactured at low cost.

Further, according to the present invention, films having various easy peel strengths can be selected for the support layer, that is, any strength can be set to some extent, and it is easy to meet the strength demands from customers.

Furthermore, by selecting a synthetic resin for the sealant layer to be melt-extruded, it is possible to adjust the heat seal start temperature without being significantly affected by the support layer. For example, when a low temperature seal resin is used for the synthetic resin, heat seal start. It is possible to lower the temperature.

It is explanatory drawing of the manufacturing method of the easy-to-open package (film) of this invention by the extrusion laminating method. It is sectional drawing which shows a part of the easy-to-open package (film) of this invention. It is sectional drawing which shows a part of the easy-to-open package (film) of this invention of claim 1. It is sectional drawing which shows a part of the easy-to-open package (film) as a reference example . It is sectional drawing which shows a part of the easy-to-open package (film) as a reference example . FIG. 3 is a cross-sectional view in which a base film (E) is laminated on the opposite surface of the sealant layer (B0) in the support layer (A1) of the cross-sectional view of FIG. It is sectional drawing which laminated the base film (E) on the support layer (A1), and (A1) = (B) without performing melt extrusion of a sealant layer (B). It is explanatory drawing of the peeling mechanism of the easy-to-open package according to claim 4 , (A) explanatory drawing before peeling, (B) explanatory drawing at the start of peeling, (C) peeling completion drawing. It is explanatory drawing of the peeling mechanism of the easy-to-open package according to claim 3 , (A) is a sectional view before opening, (B) is a peeling start view, (C) is a peeling completion view. It is explanatory drawing of the easy-opening mechanism, (A) is a coagulation peeling type, (B) is an interface peeling type, (C) is a delamination type.

The easily openable package (film) C of the present invention is a sealant layer formed by extruding a specific synthetic resin from a melt extruder D onto a support layer A by an extrusion laminating method as shown in FIGS. 1 and 2. B is an easy-to-open packaging film characterized by being composed of at least two layers.

At this time, the thickness of the sealant layer B is 1 to 40 μm. It is characterized in that after the sealant layer B is broken, it is peeled off between the layers of the support layer A and the sealant layer B. Even if the thickness of the sealant layer B is 1 to 40 μm, easy opening can be obtained, but it is preferably 5 to 12 μm.

If it is less than 5 μm, the sealing property may not be satisfactorily obtained. If it exceeds 40 μm, the breaking strength of the sealant layer B becomes large, and easy opening may not be obtained. In the delamination mechanism of the present invention, the strength of the sealant layer B at break must be 20.0 N / 15 mm width or less, and it is not preferable that the sealant layer B exceeds 40 μm.
A base film may be further provided outside the support layer A.

In the easily openable package (film) C of the present invention, when the sealant layers B are heat-sealed, the packaging bag can be formed as a lid material for another container (see FIG. 8 for the peeling mechanism). As shown in FIG. 9, in this peeling mechanism, (A) is in a state where opening is started from the position of the heat seal portion 7, (B) is in a state where opening is started from the position of the heat seal portion 7, and (C) is delaminated to the position of the heat seal portion 8. From 8 and 8, B is broken again and the package is opened. These can be used as various packages.

Next, the present invention will be described in more detail with reference to Examples 6 and 7 with reference to Examples and Comparative Examples, but the present invention is not limited thereto.

A1: Support layer (with easy peel) B1: Sealant layer (with easy peel)
A0: Support layer (without easy peeling) B0: Sealant layer (without easy peeling)

"VEP-08" (thickness 25 μm) manufactured by CKK Co., Ltd. is used for the support layer A1, "Novatec LD LC600-A" manufactured by Japan Polyethylene Corporation is used for the synthetic resin for the sealant layer B0, and two are used for the base film E. Axial stretched polyester (thickness 12 μm, manufactured by Toyobo Co., Ltd.) was used.

After dry laminating the base film E on the support layer A1 using a urethane adhesive, the synthetic resin is melt-extruded from the melt extruder D onto the other surface of the support layer A1 by extrusion lamination to form a sealant. A multilayer film F was obtained by laminating layer B0 (thickness 10 μm) (FIG. 6).

CKK Co., Ltd. "VEP-08" (thickness 25 μm) is used for the support layer A1, Mitsui DuPont Polychemical Co., Ltd. "N1108C" is used for the synthetic resin for the sealant layer B0, and the base film E is biaxial. Stretched polyester (thickness 12 μm manufactured by Toyobo Co., Ltd.) was used.

After dry laminating the base film E on the support layer A1 using a urethane adhesive, the synthetic resin is melt-extruded from the melt extruder D onto the other surface of the support layer A1 by extrusion lamination to form a sealant. A multilayer film F was obtained by laminating layer B0 (thickness 7 μm) (FIG. 6).

Comparative Example 1

"VEP-08" (thickness 25 μm) manufactured by CKK Co., Ltd. is used for the support layer A1, "Novatec LD LC600-A" manufactured by Japan Polyethylene Corporation is used for the synthetic resin for the sealant layer B0, and two are used for the base film E. Axial stretched polyester (thickness 12 μm, manufactured by Toyobo Co., Ltd.) was used.

The support layer A1 is dry-laminated with the base film E using a urethane adhesive, and then the synthetic resin is melt-extruded onto the other surface of the support layer A1 by extrusion lamination to form a sealant layer B0 (thickness 50 μm). ) Was laminated to obtain a multilayer film F (FIG. 6).

Comparative Example 2

"VEP-08" (thickness 30 μm) manufactured by CKK Co., Ltd. was used for the support layer A1, and biaxially stretched polyester (thickness 12 μm manufactured by Toyobo Co., Ltd.) was used as the base film E. The support layer A1 was dry-laminated with the base film E using a urethane-based adhesive to obtain a multilayer film G.

The sealant layer B was not melt-extruded by extrusion lamination, and the support layer A1 was used as the sealant layer B (FIG. 7).

Comparative Example 3

"CMPS101C" (thickness 30 μm) manufactured by Mitsui Chemicals, Inc. was used for the support layer A1, and biaxially stretched polyester (thickness 12 μm manufactured by Toyobo Co., Ltd.) was used as the base film E.

The support layer A1 was dry-laminated with the base film E using a urethane-based adhesive to obtain a multilayer film G.

The sealant layer B was not melt-extruded by extrusion lamination, and the support layer A1 was used as the sealant layer B (FIG. 7).

Evaluation methods

The multilayer films obtained in Examples (1 and 2) and Comparative Examples (1 to 3) were horizontally pillow-wrapped with an automatic wrapping machine as shown below to produce a bag.

Packaging machine: Horizontal pillow Packaging machine Bag making conditions: Speed 47 shots / min, vertical seal temperature 115 ° C, air pressure 0.3 MPa, horizontal seal temperature in 10 ° C increments, heat seal the sealant layers (B) to each other, length 250 mm x width A 180 mm pillow bag was used.

The following evaluations were made on this pillow bag. The results are summarized in Table 1. (1) Horizontal sealability A test piece is cut out from the horizontal seal part of the pillow bag manufactured under the above conditions into a strip with a width of 15 mm, and this test piece is peeled from the T-shape at a speed of 300 mm / min using a tensile tester. Was performed, and the heat seal strength was measured. From the obtained heat seal strength values, the heat sealability was evaluated according to the following criteria.
◯: Heat seal strength is 2N / 15mm width to 20N / 15mm width.
X: The heat seal strength is less than 2N / 15mm width or 20.1N / 15mm width or more.

(2) Openability The opening strength when the back sticker seal part of the pillow bag made under the above conditions and the opposite side of the back sticker seal part are pinched and pulled in the opposite direction is evaluated according to the following criteria. did.
Appropriate: 5 or more of the 8 monitors are evaluated as having a moderate opening feeling Heavy: 5 or more of the 8 monitors are evaluated as having a heavy opening feeling Light: 5 or more of the 8 monitors are evaluated as having an opening feeling Is evaluated as light

INDUSTRIAL APPLICABILITY The present invention can be formed by melt-extruding the sealant layer B by an extrusion laminating method using a general laminated packaging film manufacturing machine, and can be manufactured at low cost.
Further, the support layer can be selected from various films, and any easy peel strength can be set.
The multilayer film of the present invention is a packaging body for packaging foods, miscellaneous goods, industrial products, etc., and is suitable for products that can be easily opened by hand.

A Support layer A1 Support layer (with easy peeling property)
A0 support layer (without easy peeling)
B sealant layer B1 sealant layer (with easy peeling property)
B0 sealant layer (without easy peeling)
C Multilayer film D Melt extruder E Base film F Multilayer film G Multilayer film 1 Heat seal part 2 Delamination surface 3 Tensile direction 4 Opening direction 5 Sealant layer B and heat-sealing cup material 6 Cup interior 7 Heat seal part Edge (outside of cup)
8 Heat seal end (inside the cup)
9 Closure surface 10 Closure seal layer 11 Cup material

Claims (4)

A resin having no easy peeling property is formed as a sealant layer on the unstretched film supporting layer having an easy peeling property by an extrusion laminating method, and the thickness of the sealant layer is 5 to 12 μm. When the sealant layers are heat-sealed with each other or between the sealant layer and the heat-sealable thermoplastic resin layer and the sealant layer, and then the sealant layer is peeled off, the unstretched film support layer and the sealant are formed after the sealant layer is broken. A method for producing an easily openable package, which comprises peeling between layers. The sealant layer is at least one thermoplastic resin selected from a copolymer of polyolefin, cyclic polyolefin, ethylene and vinyl alcohol, vinyl acetate, acrylic acid, or methacrylic acid, ionomer, polyester, polyamide, and polystyrene. The method for producing an easily openable package according to claim 1, wherein the main component is. An easy-to-open package made of a lid material for a cup-shaped container formed by the manufacturing method according to claim 1. An easy-to-open package having a pillow bag, a gusset bag, a three-sided bag, a four-sided bag, or a stand pouch formed by the manufacturing method according to claim 1.

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